EP2003840B1 - Appareil et procédé correspondant pour la sélection et la négociation de la taille de la trame de données de communication transmises dans un système de communication radio - Google Patents

Appareil et procédé correspondant pour la sélection et la négociation de la taille de la trame de données de communication transmises dans un système de communication radio Download PDF

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EP2003840B1
EP2003840B1 EP07110297.4A EP07110297A EP2003840B1 EP 2003840 B1 EP2003840 B1 EP 2003840B1 EP 07110297 A EP07110297 A EP 07110297A EP 2003840 B1 EP2003840 B1 EP 2003840B1
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Prior art keywords
size
gan
header
frame size
mtu
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German (de)
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EP2003840A1 (fr
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Steve Michael Hanov
Charles Wang
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BlackBerry Ltd
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BlackBerry Ltd
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Priority to EP07110297.4A priority Critical patent/EP2003840B1/fr
Priority to CN 200810161123 priority patent/CN101350786B/zh
Priority to CA2635078A priority patent/CA2635078C/fr
Priority to SG200804526-2A priority patent/SG148954A1/en
Publication of EP2003840A1 publication Critical patent/EP2003840A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/166—IP fragmentation; TCP segmentation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

Definitions

  • the present invention relates generally to a manner by which to select a frame size of a frame into which communication data is formatted. More particularly, the present invention relates to apparatus, and an associated method by which to calculate, at a wireless device, an optimal frame size and to initiate negotiation, by the wireless device, of the frame size.
  • UMA/GAN Unlicensed Mobile Access/Generic Access Network
  • the mobile station e.g., calculates an optimal N201-U value and uses the values in XID negotiations, initiated at the mobile station.
  • Radio communication technologies have permitted the development and deployment of many types of radio communication systems, providing for new types of radio communication services, at lowered costs, and at greater communication throughputs.
  • Increasing numbers of users make regular use of radio communication systems through which to communicate pursuant to performance of many varied communication services, and their use is becoming an increasingly pervasive aspect of every day life.
  • Exemplary radio communication systems include, for instance, cellular communication systems, WLAN (Wireless Local Area Network) systems, and WiFi (Wireless Fidelity) network systems.
  • Each of these exemplary systems provide for radio communications with wireless devices, referred, variously, as mobile stations, mobile nodes, access terminals, etc.
  • the wireless devices regularly are of dimensions and weights permitting of their portability. That is to say, a user need not be positioned at a fixed location at which the wireless device is positioned to permit its use. Rather, the wireless device is typically, readily moveable between different locations to be operated pursuant to performance of communication services at the different locations as well as, also, operated as the wireless device is carried between the different locations.
  • a wireless device must, of course, be constructed to permit its operation to communicate by way of a particular communication system.
  • Operating standards promulgated by standard-setting bodies define, for many such radio communication systems, operational capabilities, procedures, and protocols pursuant to which the wireless devices must conform in order to permit their use pursuant to performance of a communication service.
  • a wireless device is sometimes constructed to be operable in conformity with multiple communication standards associated with a single radio communication system-type. And with convergence of communication technologies increasingly permits similar, or identical, communication services are increasingly able to be performed by different communication system-types. And, correspondingly, there is demand for wireless devices capable of communicating by way of more than one communication system-type. For instance, a multi-mode device capable of communicating by way of both a cellular communication system network and by way of a WiFi network provides a user with the capability of communicating by way of both a cellular communication system and by way of a WiFi network. Other multi-mode, wireless devices provide a user with the ability to communicate by way of other combinations of communication systems.
  • Interoperability between systems provides, for instance, procedures related to seamless transfer of communications between the respective communication systems.
  • UMA/GAN Unlicensed Mobile Access/Generic Access Network
  • IP Internet Protocol
  • IP networks include, for instance, the aforementioned WiFi network systems.
  • Such inefficiency reduces the communication efficiency and corresponding communication throughput capabilities during performance of a communication service.
  • layer 3 packets are forwarded over an IP connection using UMA/GAN protocols.
  • application level data is segmented into SNDCP frames, and the SNDCP frames are packaged into LLC frames.
  • An LLC frame is of a maximum size of an N201-U value, specified in the 3GPP operating specification. By default, such value is 500 bytes.
  • a user-data, LLC frame is packaged into one GA-PSR-UNITDATA frame, and each of such frames is sent over an IP link via a UDP packet.
  • N201-U e.g., the 500 byte size value
  • each application layer packet may be segmented into several SNDCP frames.
  • significant amounts of overhead is required, resulting in communication inefficiencies.
  • EP 1517511 A1 discloses a method of re-sizing data frames for transmitting them from a client device through an IP network.
  • U.S. patent 6,661,782 also discloses a method of re-sizing data frames for transmission through an IP network.
  • WO 2006/050753 also discloses re-sizing frames for transmission through an IP network.
  • the present invention accordingly, advantageously provides apparatus, and an associated method, by which to select a frame size of a frame into which communication data is formatted.
  • a manner is provided by which to calculate, at a wireless device, an optimal frame size to initiate, by the wireless device, negotiation of the frame size to be used pursuant to data communications.
  • negotiation of the frame size is carried out pursuant to rove-in procedures of a UMA/GAN (Unlicensed Mobile Access/Generic Access Network)-capable mobile station with a network entity, such as the SGSN (Serving GPRS Service Node) of a core network, or other appropriate entity.
  • UMA/GAN Unlicensed Mobile Access/Generic Access Network
  • SGSN Serving GPRS Service Node
  • an optimal frame size calculator is embodied at the wireless device.
  • the optimal frame size is calculated and used pursuant to the negotiation.
  • the optimal frame size is, e.g., a function of an MTU (Maximum Transmission Unit) and logical-layer header sizes.
  • the optimal frame size is, e.g., of a value corresponding to the MTU size less the logical layer header sizes and, additionally, less a maximum IPsec expansion size.
  • a user data MTU size is calculated upon successful negotiation using the calculated optimal frame size.
  • the calculated, user-data MTU size is, e.g., a function of the allowed frame size, allowed as a result of the successful negotiation and additionally, intervening, logical layer header sizes.
  • the user-data MTU size is calculated, e.g., to be the negotiated frame size, less the intervening logical-layer header sizes.
  • the calculated user-data MTU size defines the packet sizes of the user-data.
  • the frame-size negotiation, and user-data MTU size calculation are performed as part of a rove-in process and subsequent data communication service.
  • the calculation of the optimal frame size comprises calculation of an optimal LLC frame size.
  • the frame size identifies an N201-U value defined in a 3GPP standard promulgation.
  • the optimal N201-U value is calculated to be the IP bearer MTU less the max IPsec expansion less the IP header size, less the UDP header size, and less the maximum GAN header size.
  • Negotiation is initiated by the wireless device and is carried out as an XID negotiation procedure, also defined in a 3GPP standard promulgation.
  • the negotiated value is used pursuant to calculation of a user data MTU size to be used by the wireless device pursuant to communication of data by, and to, the wireless device.
  • the calculated, user-data MTU size is calculated to be equal to the allowed, i.e., negotiated N201-U value less a maximum LCC header size less a SNDCP header size.
  • the user data packets are of sizes permitting their insertion into, i.e., population of, a single LLC frame is possible. A single user data packet need not therefore be split into multiple LLC frames, and the associated increase in overhead. Improved throughput and data communication efficiency is thereby provided.
  • a frame size negotiation initiator is embodied at the wireless device.
  • the frame size negotiation initiator is configured to initiate negotiation of a frame size of a frame into which the data to be communicated is to be formatted.
  • a frame size calculator is embodied at the wireless device. The calculator is configured to calculate a desired frame size of the frame into which the data to be communicated is to be formatted. The desired frame size is used pursuant to negotiation of the frame size subsequent to negotiation initiation by the frame size negotiation initiator.
  • a radio communication system shown generally at 10, provides for radio communications with wireless devices, of which the mobile station 12 is representative.
  • the illustrated communication system includes network infrastructures of both a PLMN (Public Land Mobile Network) 14 and a UMA/GAN (Unlicensed Mobile Access/Generic Access Network) 16.
  • the UMA/GAN hereinafter referred to as a GAN, in the exemplary implementation forms a WiFi network.
  • the network 16 is representative of other GANs including, e.g., WLANs as well as other IP-based, and other, radio networks.
  • the PLMN 14, in the exemplary implementation forms a 3GPP (3 rd Generation Partnership Project)-based network.
  • the network is representative of other types of cellular, and other radio communication systems.
  • the networks 14 and 16 are coupled in communication connectivity by way of a core network 18.
  • the core network includes an SGSN (Serving GPRS Service Node) 20.
  • the network 14 is shown to include a base transceiver station (BTS) 22 and a base station controller (BSC) 24.
  • BTS base transceiver station
  • BSC base station controller
  • the UMA/GAN is shown to include an access point (AP) 26 and a UMA/GAN network controller (UNC) 28, also sometimes referred to as a GANC (Generic Access Network Controller).
  • a communication endpoint 30 is further shown in Figure 1 .
  • the communication endpoint is representative of any of various data destinations forming communication nodes used in performance of a communication service.
  • the mobile station 12 here forms a multi-mode device, capable of communications with both of the networks 14 and 16. Seamless roaming and handover of communications is provided. Rove-in procedures are carried out pursuant to transfer of communications with the PLMN 14 to the GAN 16. And, rove-out procedures are carried out pursuant to transfer, of communications with the GAN to communications with the PLMN.
  • a 3GPP standard promulgation sets forth various protocols relating to interoperability between a 3GPP PLMN and a GAN. The standard promulgations include sections relating to the forwarding of layer 3 packets over an IP connection (e.g., 3GPP Section No.
  • a maximum transmission unit, MTU is defined.
  • the WiFi MTU is of a value of 1464 bytes.
  • the packet sizes that are communicated are of sizes as close as possible to the MTU value. If, however, the aforementioned default, N201-U value is used, the data efficiency is low. E.g., the data efficiency is only about 50% capacity when the bits required for lower-layer headers are taken into account.
  • An embodiment of the present invention provides for the calculation of an optimal N201-U value that increases the data efficiency of data communications as well as permitting initiation of an N201-U value, viz., an LLC frame size. LLC and IP protocols are re-configured to facilitate optimization of the data throughput rate over GAN. Accordingly, the mobile station 12 includes an embodiment of the present invention.
  • the apparatus 32 is coupled to the transceiver circuitry, here represented by a transmit (TX) part 34 and a receive (RX) part 36.
  • TX transmit
  • RX receive
  • the entities of the apparatus include an optimal frame size calculator 42, a negotiation initiator and negotiator 46, and a user data MTU size calculator 52.
  • the apparatus 32 is operable part of a, or upon start of, a rove-in procedure.
  • the optimal frame size calculator 42 calculates an optimal frame size to form an optimal N201-U value.
  • the calculator calculates the optimal LLC frame size, i.e., the optimal N201-U value according to the equation:
  • N 201 ⁇ U value IP bearer MTU ⁇ MAX IPSec expansion ⁇ IP header size ⁇ UDP header size ⁇ max GAN header size
  • the calculated value calculated by the calculator 42 is provided to the negotiation initiator and negotiator 46.
  • the negotiation initiator operates to initiate a frame size negotiation with the network part of the communication system 10.
  • the negotiation initiator generates one or more messages, at least one of which includes the calculated value calculated by the calculator.
  • the negotiation of the frame size hereby initiated at the mobile station, rather than at the network.
  • the initiator and negotiator 46 is here shown to be coupled to the transmit part 34. The messages formed by the entity 46 are thereby caused to be transmitted by the mobile station to the network.
  • the transmitted messages are detected at the PLMN 14 and routed on to the SGSN 20.
  • the SGSN or other network entity, includes further apparatus 62, of an embodiment of the present invention.
  • the apparatus 62 is also functionally represented, formed of functional entities, implemented in any desired manner, including, for instance, the execution of algorithms by processing devices.
  • the apparatus is shown to include a detector 64, a decider 66, and a responder 68.
  • the detector operates to detect the negotiation initiation, and other, messages relating to the frame-size negotiation, initiated by the mobile station. In particular, the detector detects a message containing a value of the optimal N201-U value calculated by the calculator 42. The detector provides the detected value of the calculated, optimal N201-U value, and provides an indication thereof to the decider 66. The decider operates to decide whether to accept the optimal N201-U value. If decision is made to accept the calculated N201-U value, calculated at the mobile station, an indication of the acceptance is provided to the responder 68. The responder operates to send a response to the mobile station indicating acceptance of the requested value.
  • the decider decides an alternate N201-U value, and, the alternate value is provided to the responder and the responder sends a message back to the mobile station identifying the alternate N201-U value.
  • the requested, or alternate, N201-U value forms the allowed N201-U value.
  • the response message formed by the responder is routed through the PLMN, sent to the mobile station by way of a radio air interface defined between the network and the mobile station, detected by the receive part 36 of the mobile station, and provided to the initiator and negotiator 46.
  • the value, forming the negotiated value, is provided to the user data MTU size calculator 52.
  • the calculated value is used pursuant to formatting of the user data, and the calculated value is here shown to be provided to the transmit part 34.
  • FIG. 2 a representation shown generally at 82, shows various of the logical levels defined in the communication system 10, shown in Figure 1 .
  • the illustrated logical levels include an application layer 84, an SNDCP layer 86, an LLC layer 88, a GAN layer 92, a UDP layer 94, an IP layer 96, and an IPsec layer 98. Details associated with the respective layers are set forth in specification standards relating to the various parts of the communication system. Review of the representation illustrates frames defined at various of the logical layers, each including spare parts.
  • an SNDCP-layer frame includes a header part 104
  • an LLC-layer frame includes a header part 106
  • a GAN-layer frame includes a header part 112
  • a UDP-layer frame includes a header part 116
  • an IP-layer frame includes a header part 120
  • an IPsec-layer frame includes a header part 124.
  • the frame length i.e., the N201-U value, represented at 128, at the LLC layer 88.
  • the calculation of the optimal N201-U value, noted above to be performed by the calculator 42, shown in Figure 1 takes into account the overhead, e.g., the header parts, of the structures formed at the layers beneath the LLC layer.
  • Figure 2 illustrates the MTU size 134 of the user data formed at the application layer 84. This size takes into account the overhead, e.g., the header parts 104 and 106 at the SNDCP and LLC layers 86 and 88.
  • the MTU size takes into account the N201-U value 128.
  • the MTU size 134 is constrained to be close to an optimal size, thereby to improve the resultant throughput and efficiency of operation of data communication pursuant to performance of a communication service.
  • FIG. 3 illustrates a process diagram 142, representative of the process of operation of an embodiment of the present invention. Operation commences at the mobile station 12 with the start block 144. A determination is made, as indicated by the decision block 146, as to whether a rove-in procedure is to commence. If not, the no branch is taken back to the decision block. If conversely, rove-in is to proceed, the yes branch is taken to the block 148. At the block 148, an optimal LLC frame size is calculated. Then, and as indicated by the block 152, negotiation of an allowable frame size commences, initiated at the mobile station.
  • the segment 154 is representative of a message sent by the mobile station to the SGSN 20 that identifies the calculated, optimal frame size, i.e., the N201-U value.
  • the message is sent as part of an XID negotiation, set forth in a 3GPP operating specification. Detection, decision, and response is made at the SGSN, and a response message, indicated by the segment 156, is returned to the mobile station.
  • the response message allows the calculated value to be used or provides an alternate value.
  • the user data MTU size is calculated, making use of the allocated N201-U value.
  • user data is formed into packets of sizes within the calculated MTU size.
  • the data is formatted further at lower logical layers.
  • the block 172 is representative of communication of data between the mobile station and a communication endpoint in which user data of packets of sizes within the calculated MTU size are utilized. The same sizing is used at both the mobile station and the communication endpoint when communications are bi-directional.
  • Figure 4 illustrates a method flow diagram, shown generally at 182, representative of the method of operation of an embodiment of the present invention.
  • the method facilitates communication of data by a wireless device.
  • a desired frame size is calculated at the wireless device.
  • the desired frame size is the desired size of the frame into which the data to be communicated is to be formatted.
  • a frame-size negotiation is initiated at the wireless device of a frame size of a frame into which the data to be communicated is to be formatted.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Claims (13)

  1. Appareil pour un dispositif sans fil multimodal (12) ayant pour fonction de communiquer avec un réseau mobile terrestre public, RMTP (14) et un réseau d'accès générique, GAN, (16), l'appareil étant destiné à faciliter la négociation de couche contrôle de lien logique, LLC, conformément à un balayage par le dispositif sans fil (12), ledit appareil comprenant :
    un donneur d'ordre de communication configuré pour déterminer un besoin de balayage du RMTP (14) au GAN (16) ;
    un calculateur de taille de trame (42) configuré pour calculer, en réponse à un besoin déterminé de balayage, une taille de trame souhaitée pour le GAN, ladite taille de trame souhaitée comprenant une valeur optimale au niveau de la couche LLC, la valeur optimale étant une unité de transmission maximale de porteur IP, MTU, du GAN moins une pluralité de tailles d'en-tête et moins une taille d'expansion IPSec ;
    un émetteur (34) configuré pour transmettre la négociation de taille de trame de la trame dans laquelle les données à communiquer doivent être formatées avec une procédure d'échange d'identité (exchange IDentity), XID, la négociation de taille de trame utilisant la taille de trame souhaitée calculée ;
    un récepteur (36) configuré pour recevoir un message de réponse permettant d'utiliser la taille de trame souhaitée calculée pour calculer une taille de MTU de données d'utilisateur ; et
    un calculateur de taille de MTU de données d'utilisateur (52) configuré pour former des données d'utilisateur en paquets de tailles, dans ladite taille de MTU de données d'utilisateur calculée.
  2. Appareil selon la revendication 1, dans lequel le RMTP est un réseau 3GPP, Projet de Partenariat de Troisième Génération.
  3. Appareil selon la revendication 1, dans lequel le GAN (16) est un réseau WiFi, Wireless Fidelity.
  4. Appareil selon la revendication 1, dans lequel la valeur optimale est une valeur N201-U.
  5. Appareil selon la revendication 4, dans lequel la pluralité de tailles d'en-tête comprend une taille d'entête IP maximum, une taille d'en-tête UDP maximum, et une taille d'en-tête GAN maximum, et une taille d'en-tête LLC maximum.
  6. Appareil selon la revendication 1, comprenant en outre un calculateur (42) configuré pour calculer la valeur optimale.
  7. Appareil selon la revendication 6, dans lequel l'émetteur (34) est configuré pour transmettre les valeurs optimales calculées par ledit calculateur.
  8. Procédé (142) pour un dispositif sans fil multimodal ayant pour fonction de communiquer avec un réseau mobile terrestre public, RMTP, (14) et un réseau d'accès générique, GAN (16), le procédé étant destiné à la négociation de couche contrôle de lien logique, LLC, conformément à un balayage par le dispositif sans fil, ledit procédé comprenant les opérations consistant à :
    déterminer un besoin de balayage (146) du RMTP (14) au GAN (16) ;
    en réponse à un besoin déterminé de balayage, calculer une taille de trame souhaitée pour le GAN (148) comprenant une valeur optimale au niveau de la couche LLC, la valeur optimale étant une unité de transmission maximale, MTU, de porteur d'IP, Protocole internet, du GAN moins une pluralité de tailles d'en-têtes et moins une taille d'expansion IPSec ;
    débuter une négociation de taille de trame (152) de la trame dans laquelle les données à communiquer doivent être formatées selon une procédure d'échange d'identité, XID, la négociation de taille de trame utilisant la taille de trame souhaitée calculée ;
    recevoir un message de réponse (156) permettant d'utiliser la taille de trame souhaitée calculée pour calculer une taille de MTU de données d'utilisateur, et
    former des données d'utilisateur en paquets (164) de tailles dans ladite taille de MTU de données d'utilisateur calculée.
  9. Procédé (142) selon la revendication 8, dans lequel le RMTP est un réseau 3GPP (14).
  10. Procédé (142) selon la revendication 8, dans lequel le GAN est un réseau WiFi.
  11. Procédé (142) selon la revendication 8, dans lequel la valeur optimale est une valeur N201-U.
  12. Procédé (142) selon la revendication 11, dans lequel la pluralité de tailles d'en-tête comprend une taille d'en-tête IP maximum, une taille d'en-tête UDP maximum, et une taille d'en-tête GAN maximum et une taille d'en-tête LLC maximum.
  13. Support lisible sur ordinateur comprenant des instructions lisibles sur ordinateur qui, lorsqu'elles sont exécutées par un processeur, amènent le processeur à réaliser le procédé selon l'une quelconque des revendications 8 à 12.
EP07110297.4A 2007-06-14 2007-06-14 Appareil et procédé correspondant pour la sélection et la négociation de la taille de la trame de données de communication transmises dans un système de communication radio Active EP2003840B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP07110297.4A EP2003840B1 (fr) 2007-06-14 2007-06-14 Appareil et procédé correspondant pour la sélection et la négociation de la taille de la trame de données de communication transmises dans un système de communication radio
CN 200810161123 CN101350786B (zh) 2007-06-14 2008-06-13 用于选择和协商通信数据的帧大小的装置及其方法
CA2635078A CA2635078C (fr) 2007-06-14 2008-06-13 Dispositif et methode associee pour selectionner et traiter la taille des blocs de donnees de communication transmises dans un systeme de radiocommunication
SG200804526-2A SG148954A1 (en) 2007-06-14 2008-06-13 Apparatus, and associated method, for selecting and negotiating frame size of communication data communicated in a radio communication system

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EP07110297.4A EP2003840B1 (fr) 2007-06-14 2007-06-14 Appareil et procédé correspondant pour la sélection et la négociation de la taille de la trame de données de communication transmises dans un système de communication radio

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CN103108407B (zh) * 2011-11-09 2015-04-01 中兴通讯股份有限公司 基于gprs系统的协议层间数据分段、重组处理方法和装置

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Publication number Priority date Publication date Assignee Title
US20050185619A1 (en) * 2004-02-23 2005-08-25 Nokia Corporation Method for performing packet switched handover in a mobile communication system

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CN101350786A (zh) 2009-01-21
CA2635078C (fr) 2015-12-01
CN101350786B (zh) 2013-05-22
CA2635078A1 (fr) 2008-12-14
EP2003840A1 (fr) 2008-12-17

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